Revert "Revert "Prevent UAF issues caused by static destructors""

We were not initializing the frame_pop_enabled field of EventHandler
so it was undefined. If it happened to be true then the FramePop
handlers will never be installed and the FramePop events will never be
triggered.

This reverts commit 6a94cec7.

Reason for revert: fixed issue with frame pop

Test: ./test/testrunner/testrunner.py -a --host -t 923
Bug: 69591477

Change-Id: Id47f91a76b6e7c9326e94d7cbdf8c5472bffb58a